Related to #13866.

(cherry picked from commit 09ca192)

(cherry picked from commit f1fd3ef)

(cherry picked from commit e6d8708)

* Fix #13889

* Add testcase

* Reduce test time

Co-authored-by: Elie Zedeck RANDRIAMIANDRIRAY <elie.zedeck@gmail.com>
(cherry picked from commit 92c4aad)

) [backport:1.2]

* fix #13902 distinct uint64 type corruption on 32-bit with borrow

Co-authored-by: Timothee Cour <timothee.cour2+lightsail@gmail.com>
(cherry picked from commit 95fd8ae)

Co-authored-by: cooldome <ariabushenko@bk.ru>
(cherry picked from commit f86fc53)

…ckport]

This fixes at least a couple of issues:

* Procs loaded from the DLL being used even when the pointer is nil.
* The actual issue (#13903) which appeared to cause stack corruption on
  Android 7.1.1 with OpenSSL 1.1.1f. The change that fixed this was the
  move to loading the procs in `sslSym`.

(cherry picked from commit 350ee03)

(cherry picked from commit 06e0c75)

Co-authored-by: cooldome <ariabushenko@bk.ru>
(cherry picked from commit f10689d)

Co-authored-by: cooldome <ariabushenko@bk.ru>
(cherry picked from commit d839eb9)

…) [backport:1.2]

* fix nim-lang/RFCs#211: `var a: DateTime` works
* assertValidDate checks for sentinel month

(cherry picked from commit e3919b6)

This let us see the definition of `Callback` in docs, which is required
to even make use of asyncdispatch.

Ref #13539.

(cherry picked from commit 7beed44)

(cherry picked from commit 1b6c4ed)

Path with spaces should be added as is, quoting them makes utilities
treat the quotes as part of the path. This makes `nim` unable to be used
from the command line even if it appears to be added to user's Path
environment variable.

Even more confusing, Windows 10's PATH editor shows the path without any
quotes, you only see them when you use "Edit text". Took me a good 15
minutes to figure out why couldn't I run `nim` despite it being in Path.

(cherry picked from commit 22418ce)

It's also just faster to get the current file name instead of scanning
the PATH.

(cherry picked from commit 4b43d42)

(cherry picked from commit f07f07e)

…#14085)

One more compiler source-specific tackled

(cherry picked from commit dd5ccc3)

(cherry picked from commit d5b7e99)

Fixes jsffi usage example in doc

(cherry picked from commit 362c896)

(cherry picked from commit 31ba275)

… [backport:1.2]

(cherry picked from commit b8d7a98)

(cherry picked from commit 35b0463)

(cherry picked from commit d9e907c)

(cherry picked from commit bd57f0c)

* fixes #14054

* make tests green again

* more tests are green

* maybe now

(cherry picked from commit cc60cae)

(cherry picked from commit cf3e000)

(cherry picked from commit 89be5be)

…4180)

(cherry picked from commit d5fc35c)

…ort] (#14187)

Ref: https://irclogs.nim-lang.org/01-05-2020.html#15:18:03
(cherry picked from commit 0880f11)

(cherry picked from commit 87ac28d)

(cherry picked from commit d5c014e)

…1.2]

* destructors: don't produce stupid code for 'cast'

* fixes #14207

(cherry picked from commit b6fb609)

* fixes #14209 [backport:1.2]
* improve stability

(cherry picked from commit 64e839d)

Refs #13764

(cherry picked from commit 1a1e998)

…ocking IO [backport] (#14296)

(cherry picked from commit d11cb9d)

…4277)

(cherry picked from commit 363b7ff)

(cherry picked from commit 76f7e95)

(cherry picked from commit f3e17e7)

(cherry picked from commit 82870e0)

…[backport] (#14341)

Fixes #14338 .

(cherry picked from commit a2a3fa1)

* add test
* add changelod entry
Co-authored-by: cooldome <ariabushenko@bk.ru>

(cherry picked from commit 9295251)

* Fix the DFA for "unstructured controlflow"

* Add testcase from #14233

(cherry picked from commit 42db75c)

(cherry picked from commit 3616b06)

(cherry picked from commit 517dd80)